"vertcat" error with array of strings
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I have an array of strings, which is used to store a collection of filenames to retrieve data. Depending on the task at hand, sometimes I need to access the data from only certain files, in which case I would like to comment out some filenames from the array.
When I do that, I get an error saying:
Error using ==> vertcat
CAT arguments dimensions are not consistent.
Here's a test program that illustrates the problem:
fprintf('\n\n BEGIN \n\n');
input_file_array = {...
'test1.txt',...
'test2.txt', ...
%'test3.txt', ...
'test4.txt', ...
};
fprintf('\n\n DONE \n\n');
Note that I get the error only when there is a continuation of the array elements after the commented line (but if I were to comment out both test3 and test4, I get no error).
I'm using Matlab R2007a.
采纳的回答
Walter Roberson
2011-3-2
You can't do that. The commented out line is treated as a blank line, which switches over the parsing to vertical concatenation, the same as if you were using { 'test1.txt', ... 'test2.txt' 'test4.txt' }
which would be equivalent to trying to do
{ 'test1.txt', 'test2.txt'; 'test4.txt'}
What I suggest is that you switch over to vertical concatenation anyhow. Transpose the resulting cell array if you need to:
input_file_array = {...
'test1.txt';...
'test2.txt'; ...
%'test3.txt'; ...
'test4.txt'; ...
};
The % will be treated as a blank line with the implied vertical concatenation, but since you are using vertical concatenation anyhow you don't run in to a conflict.
You can simplify this code as:
input_file_array = {
'test1.txt'
'test2.txt'
%'test3.txt'
'test4.txt'
};
taking advantage of the implicit vertical concatenation.
更多回答（2 个）
Andrew Newell
2011-3-2
That commented line is just like having an empty line in the middle of your command (try it!). You could do this:
input_file_array = {...
'test1.txt',...
'test2.txt', ... %'test3.txt', ...
'test4.txt', ...
};
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